424 MR. A. SANDERS ON THE [June 9, 
biceps femoris, and is inserted into the dorsal surface of the femur 
dorsad of the crureus, on a line corresponding to the insertion of the 
last muscle ; in its course it is situated in close juxtaposition to the 
capsular ligament of the hip-joint. 
Vastus and crureus.—The externus arises in intimate fusion with 
the crureus; it commences narrow immediately behind the head of 
the femur, between the insertions of the adductor magnus and the 
gluteus medius, and covers the outer and upper surface of the bone. 
The internus is smaller, and arises from about half the ventral sur- 
face of the femur. They are inserted with the rectus into the patella. 
Extensor tarsi arises from the middle half of the tibia, being 
superficial to all the other muscles of the flexor side of the leg; it 
crosses the limb obliquely, and is inserted into the base of the meta- 
tarsal bone of the fifth digit, and fascia covering the tarsus. 
Flexor perforatus arises narrow from the fibular condyle of the 
humerus, and, forming a broad muscular mass in the leg, it is inserted 
partly tendinous and partly muscular into an apophysis of the cuboid 
bone of the tarsus, and is continued into the plantar surface of the 
foot by means of five muscular fasciculi, which are inserted into the 
metatarsal bones by two heads, between which the long flexor-ten- 
dons pass; the one belonging to the fourth digit is also mserted into 
the base of the first phalanx; that of the fifth has in addition an 
attachment along the whole length of its metatarsal bone. 
Flexor longus digitorum arises from the peroneal condyle of the 
humerus in conjunction with the last, and also from the interarticular 
cartilage of the knee-joint, also from the proximal half of the fibula ; 
it is inserted into three-fourths of the length of the tibia, which 
part, perhaps, represents the popliteus. Continuing down the leg it 
developes a broad tendon, occupying the plantar surface of foot, 
dorsad of the last ; here it divides into four long tendons, which are in- 
serted into the terminal phalanx of the pollex and of the second, third, 
and fourth digits; the long tendon belonging to the fifth digit is 
given off from the muscle about the middle of the leg, and, passing 
round the projecting apophysis of the cuboid, goes to the terminal 
phalanx of that digit. 
Flexor accessorius digitorum.—There are four muscular slips 
which may be collectively called by this name. The one belonging 
to the fourth digit arises from the tendon of the long flexor going to 
that digit, and gives off a tendon of its own inserted into the base of 
its third phalanx; the slip belonging to the third digit arises from 
the cuboid bone; those of the second and hallux from the cunei- 
form (these join the long tendon); those of the second and third 
digits have in addition slender tendons, which are inserted into the 
second phalanges of those digits. 
Lumbricales.—There are five—one on the peroneal side of the 
second digit, one on each side of the third digit, one on each side of 
the fourth digit. 
Adductores digitorum form the third layer in the sole of the foot. 
They consist of four muscular slips arising from the cuboid; three 
evoss the plantar surface and are inserted into the peroneal side of 
